Electric-lamp switch



(No Model.)

F. SGHABPER.

ELBOTRIG'BAMP SWITUH. No. 339,218. Patented Apr.'6, 1886..

N. PETERS. Phomulhagraplwr, Wnlhingion. D. C.

llnrrn STATES PATENT OFFICE.

FREDERICK SCHAEFER, OF BOSTON, MASSACHUSETTS.

ELECTRIC-LAMP SWITCH.

SPECIFICATION forming part of Letters Patent No. 339,218, dated April 6, 1886.

Application filed October 12, 1885. Serial No. 179,601.

To all whom it may concern:

Be it known that I, FREDERICK SCHAEFER, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Electric-Lamp Switches, of which the following description, in connection with the ac companying drawings, is a specification, like letters on the drawings representing like parts.

My invention in incandescent electric lamps is especially adapted to be used in connection with a lamp-holder such as described in United States application Serial No. 166,382, dated May 22, 1885, and has for its object to provide the said holder with a switch which shall be simple in construction, yet sure and reliable in operation.

My invention consists, essentially, of a key having on its shank a metal collar provided with an insulating-block, and an insulatingdisk slotted to receive the said key and its collar, the said disk being provided with contact-pieces placed above and below the said collar, the said contact-pieces being engaged by the metallic part of the said collar to complete the circuit of the lamp when the key is in one position, and being engaged by the insulating-block of the said collar to break the circuit when the key is in another position.

My invention further consists in details of construction, to be hereinafter pointed out and claimed.

Figure 1 is a sectional elevation of a lamp embodying my invention. Fig. 2 shows an under side view of the insulatingdisk and key; Fig. 3, a section of Fig. 2 on line 00' w, and Fig. 4 a perspective view of the key with its thumb-piece removed.

The bulb A, containing the filament a, and embedded in the plaster-of-paris base I), the band d, having pins 0, the grooved shell or case 1), terminal lugs f, threaded socket K, and spring m, are all substantially as described in the application referred to, wherein they are designated by like letters.

The insulating-disk a herein shown is slotted at 2 to receive a collar, 0, to be described, fast on the shank of a key, 3, pro- (No model.)

vided with a handle, 4, by which to turn it and the said collar. The shank of the key 3 is extended across the usual central opening, 5, for the line-wires, and into an opening in the opposite side of the insulating-disk, the latter opening forming a bearing for the shank of the key.

The collar on the shank of the key is here in shown as composed of metal, and slotted transversely to receive an insulating-block, 13, the collar being cut away, as at 14, (see Fig. 4,) the said collar and the insulatingblock being further cut away to form grooves, as at 15 16, to co-operate with the projection 10 of the contact-piece 7 and form a locking device for the key. The insulating-disk a is also partially cut away at its under side, as at 6, and has secured to it the yielding contact-arm 7 and plate 8 by screws 9. (See Fig. 2.)

The line-wire 17 is secured by the screw 18 to the plate 8, and the other line-wire, 19, is fastened to the contact-plate c on the insulating-disk a by the headedscrew 3 which serves as a stop to prevent rotation of the lamp B, as described in the application referred to. The metal plate or contact-piece 0 extended over the slot 2, co-operates with the metal part of the collar and completesthe circuit of the lamp when the key is turned to put the lamp in the line-circuit. An insulating-plate, 20, separates the plate 8 from the supporting-spring m, and a small insulating-washer, 21, prevents the metal collar from making contact with the shell or case D when the key is turned to close the switch, thus preventing the said case from becoming charged.

1 claim- 1. A switch for incandescent lamps, consisting of a key provided with a collar composed of metal and insulating material, substantially as described, combined with the insulating-disk (6 provided with the slot 2, in which to receive the said collar, and with contact-pieces secured to the said insulatingdisk to co-operate with the said collar, as and for the purpose set forth.

2. The key provided with a collar of metal and insulating material, snbstantiallyas de- In testimony whereof I have signed my name scribed, and provided with grooves 15 16, to this speeification in thepresence of two subeombined with the insulating-disk a, slotted scribing witnesses.

to receive the said collar, and with the con- FREDERICK SOHAEFER. 5 tact-pieces c,c ,and 7, the latter having a. pro- W'itnesses:

jection to enterone of the said grooves to E. W. BURDETT,

lock the switch, substantially as described. J. H. CHURCHILL. 

